Led by University of Arizona archaeologists, the team's excavations of the ancient Maya lowlands site of Ceibal suggest that as the society transitioned from a heavy reliance on foraging to farming, mobile communities and settled groups co-existed and may have come together to collaborate on construction projects and participate in public ceremonies.
The findings challenge two common assumptions: that mobile and sedentary groups maintained separate communities, and that public buildings were constructed only after a society had fully put down roots.
"Our study presents the first relatively concrete evidence that mobile and sedentary people came together to build a ceremonial centre," Inomata said.
A public plaza uncovered at Ceibal dates to about 950 BC, with surrounding ceremonial buildings growing to monumental sizes by about 800 BC.
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Yet, evidence of permanent residential dwellings in the area during that time is scarce. Most people were still living a traditional hunter-gatherer-like lifestyle, moving from place to place throughout the rainforest, as they would continue to do for five or six more centuries.
Inomata and his colleagues theorise that groups with varying degrees of mobility came together to construct the buildings and to participate in public ceremonies over the next several hundred years.
That process likely helped them to bond socially and eventually make the transition to a fully sedentary society.
"This tells us something about the importance of ritual and construction. People tend to think that you have a developed society and then building comes. I think in many cases it's the other way around," Inomata said.
"The process of gathering for ritual and gathering for construction helped bring together different people who were doing different things, and eventually that contributed to the later development of Maya civilisation," Inomata said.
"Discovering an ancient 'melting pot' is definitely the unexpected highlight of this research," Burham said.
The study was published in Proceedings of the National Academy of Sciences.